Priority Energy, Energy Code Facts, IL

Reduce the Cost of Energy Code Compliance!

With the adoption of the International Energy Conservation Code (IECC), home building and commercial construction has taken on an extra layer of complexity. The code is intended to increase the efficiency of the homes we’re building through added insulation, air sealing and other efficiency measures. Every three years, the IECC publishes a new version (see how the code has changed over time).

The IECC code is customized per location and climate zone. The state of Illinois falls into either Climate Zone 4 (mid to southern Illinois) or Climate Zone 5 (mid to northern Illinois). IECC Energy Codes layout a prescriptive path for compliance which requires specific levels of insulation, mandatory building performance testing and requirements for mechanical systems (heating, cooling, ventilation and water heating) which must be met to comply with the code.

Alternative Methods of Compliance

The IECC has always offered alternative, performance-based methods of compliance, including:

U-Average

Rather than using a specific insulation value in each area of the house, your home simply needs to use the same amount on average, offering tradeoffs in R-values across the home.

Performance Path

This allows the home’s estimated cost of heating, cooling and water heating to be calculated and compared to a home built on prescriptive standards. This does not take into account mechanical efficiencies (except for ventilation), and is focused on the building envelope only. If the home being built is equal to or more efficient than the prescriptive home, it complies with code.

Energy Rating Index

Starting with the IECC 2015 version of the code, there is another method to prove compliance which allows the entire home’s energy usage to be taken into account (building envelope, heating, cooling, lighting, appliances, and ventilation): the Energy Rating Index, such as the HERS Index.

Additionally, through feedback from various parties--including the National Association of Home Builders (NAHB), the Midwest Energy Efficiency Alliance (MEEA), manufacturers and building science professionals like Priority Energy--the State of Illinois amended the code effectively adopting our own version of the IECC Energy Codes.

Confused yet? Don’t worry – we can help. Please see our Energy Code Assistance page or call us at 800-737-2299 to learn more.

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    Anonymous Builder
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    P.I.
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    A.S. Architect
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  • There is much less dust in the house and the monthly gas and electric charges have been reduced by 10 to 15%.....I'm sure I will see greater savings over a twelve month period......thanks again.

    Aeroseal Client, R.N.
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    Such a convenient and well-set-up training and test center with caring and knowledgeable staff and proctors! Thanks folks!

     

    P.R., Ottawa, IL
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    Miruna; Tenant at Country Manor Apartments, Peru, IL
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    Executive at Medline Industries, IL
  • I have a two story home built in the mid seventies. Lots of temperature fluctuation between the floors. The Aeroseal process dramatically increased the air flow to the second floor. Good experience. The company was very informative, answered a lot of questions.

    Vince from Oakbrook, IL
  • "It's been cold here for the past few days and I really feel the difference in heating since the Aeroseal, my apartment is so much warmer now. Thank you!"  

    MP from Peru, IL
  • Thank You so much for the super-fast turn around of our Manual J, D and S reprt for the Village of Glen Ellyn. Our original Manual J kept getting kicked back to us for corrections but your calculations/report got approved instantly-no questions asked and no more permit delays!

    Kim, Glen Ellyn, IL
  • Thank you. Truly. I appreciate you taking the time to clarify things for me and then going above and beyond to ensure that my CEUs are handled for our current RESNET cycle. You’ve always been kind to me and this is another shining example of that.

    Craig, HERS Rater, Batavia, IL

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